Dacheng Song, Xingyuan Zhang, Chao Chen. Numerical Study on Rapid Detection of V-Shaped Cracks Based on Surface Acoustic Wave[J]. Laser & Optoelectronics Progress, 2021, 58(5): 0514004
- Laser & Optoelectronics Progress
- Vol. 58, Issue 5, 0514004 (2021)
Fig. 1. Spectrum of incident surface waves at a rise time of 10 ns
Fig. 2. Finite element model of laser excitation and reception
Fig. 3. Displacement waveform diagrams when crack depth is 0 μm, 200 μm, and 400 μm. （a）（b） Displacement waveform diagrams of left receiving point； （c） displacement waveform diagram of right receiving point
Fig. 4. Trend graph of RR signal peaks at different crack depths
Fig. 5. Displacement waveform diagram of left receiving point when the crack depth is 500 μm
Fig. 6. Displacement waveform diagram of left receiving point when the crack depth is 1000‒5000 μm
Fig. 7. Mechanism of surface acoustic wave and medium-depth crack
Fig. 8. Displacement waveform diagram of left receiving point when the crack depth is 6000 μm
Fig. 9. Mechanism of surface acoustic wave and deep crack
Fig. 10. Displacement waveform diagram of right receiving point when the crack depth is 6000 μm and 7000 μm
Fig. 11. Comparison of actual and calculated crack depths
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Table 1. Various mechanical parameters of aluminum and internal acoustic wave transmission speed in the finite element model
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